Unusual Selective Monitoring of <i>N,N</i>-Dimethylformamide in a Two-Dimensional Material Field-Effect Transistor.
basic_science · Level V
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- Record sourced from PubMed, PMID 37458690.
- Also identified by DOI 10.1021/acsnano.3c03915.
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Abstract
<i>N</i>,<i>N</i>-Dimethylformamide (DMF) is an essential solvent in industries and pharmaceutics. Its market size range was estimated to be 2 billion U.S. dollars in 2022. Monitoring DMF in solution environments in real time is significant because of its toxicity. However, DMF is not a redox-active molecule; therefore, selective monitoring of DMF in solutions, especially in polar aqueous solutions, in real time is extremely difficult. In this paper, we propose a selective DMF sensor using a molybdenum disulfide (MoS<sub>2</sub>) field-effect transistor (FET). The sensor responds to DMF molecules but not to similar molecules of formamide, <i>N</i>,<i>N</i>-diethylformamide, and <i>N</i>,<i>N</i>-dimethylacetamide. The plausible atomic mechanism is the oxygen substitution sites on MoS<sub>2</sub>, on which the DMF molecule shows an exceptional orientation. The thin structure of MoS<sub>2</sub>-FET can be incorporated into a microfluidic chamber, which leads to DMF monitoring in real time by exchanging solutions subsequently. The designed device shows DMF monitoring in NaCl ionic solutions from 1 to 200 μL/mL. This work proposes the concept of selectively monitoring redox-inactive molecules based on the nonideal atomic affinity site on the surface of two-dimensional semiconductors.